Fastening arrangement of a machine base and method of fastening the same

ABSTRACT

A fastening arrangement of a machine base ( 8 ) of a machine on foundations ( 1 ). The fastening arrangement includes a foundation recess ( 3 ), filled with concrete ( 71, 72 ) and having an inner anchor shank ( 4 ), a foundation plate ( 2 ) of steel on the foundation ( 1 ), the machine base ( 8 ) on the foundation plate ( 2 ), an anti-fatigue bolt/stud bolt ( 9 ) restraining the machine against the foundation ( 1 ), the anti-fatigue bolt/stud bolt ( 9 ) being screwed into the anchor shank ( 4 ). The anchor shank ( 4 ) has at least two threaded disks ( 5 ) arranged offset from one another. The anti-fatigue bolt/stud bolt ( 9 ) screwed into the anchor shank ( 4 ) is passed through the foundation plate ( 2 ) and the machine base ( 8 ).

[0001] This application claims priority under 35 U.S.C. § 119 to SwissApplication No. 01141/03, filed 27 Jun. 2003, the entirety of which isincorporated by reference herein.

BACKGROUND OF THE INVENTION

[0002] 1.Field of the Invention

[0003] The present invention relates to a fastening arrangement of amachine base and to a method of fastening a machine base of a machine.

[0004] 2. Brief Description of the Related Art

[0005] Foundation anchors are normally used to fasten machines or othercomponents on their foundation, which is usually precast from concrete.The anchor screws or bolts used in this case are screwed with theirbottom threaded shank into threaded plates which are fastened in or tothe foundation. With their top threaded shank, the machine to befastened is fastened to the machine base by means of a nut. Thefoundation anchors in particular of large machines must be designed forthe direct transmission of very large forces (usually malfunctionforces) and prevent the machine from lifting from the foundation. Inaddition, compensating elements must be provided in order to be able toorient the machines or the entire machine set.

[0006] Such foundation anchors have been disclosed, for example, by thepublications U.S. Pat. No. 2,952,947, DE-A-25 24 682, U.S. Pat. No.3,401,733, DE-A1-42 27 924, DE-A1-41 39 387, CH-A5-676 876, DE-A1-43 35485, DE-A1-100 09 072 or DE-A-2 011 468.

[0007] Many of these embodiments either use means for compensating forthe height, or alternatively have wedges (CH-A5-676 876, FIG. 1)arranged for flatness compensation. However, a disadvantage with DE-A-2524 682, DE-A-2 304 132 and DE-A1-41 39 387 is that the machine cannot bepushed over a flat surface onto the main foundation.

[0008] Publication DE-A-2 304 132 discloses a solution for anchoring ananchor shank in the foundation and for restraining the machine base.Furthermore, there is a spatially adjustable support which is verticallyadjustable and is at the same time provided with an adjusting screw forthe flatness compensation. Less advantageous, however, is the fact that,firstly, the support is cast in place in the foundation. Secondly, theanchoring parts project from the foundation during the installation.These anchoring parts are therefore a hindrance during the setting-up ofthe machine. In addition, there is a risk of injury due to theprojecting anchor bolts.

SUMMARY OF THE INVENTION

[0009] Accordingly, one object of the present invention, ascharacterized in the claims, is to avoid the disadvantages which areknown from the prior art. The invention achieves the object of providinga method of fastening a machine base and in addition of providing thefastening of a machine base of a machine, this fastening beingdistinguished by a simple construction. This is intended in particularto reduce the complexity of the fastening.

[0010] It is advantageous that the anchor shank is sunk in thefoundation, so that the setting-up of the machine is in no way impaired.The actual installation is then effected via an anti-fatigue bolt orstud bolt which is screwed through the foundation plate and the machinebase into the top part of the anchor shank and restrained. Theanti-fatigue bolt or stud bolt, or the anchoring system, can bepreloaded hydraulically or by a torque wrench.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] A more complete appreciation of the invention and many of theattendant advantages thereof will be readily obtained as the samebecomes better understood by reference to the following detaileddescription when considered in connection with the accompanying drawing.The invention is illustrated with reference to the attached figure,which shows a foundation of a machine having an inner anchor shank. Onlythe elements essential for the invention are shown.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A method of fastening a machine base 8 of a machine on afoundation 1 and also a corresponding fastening arrangement aredescribed. Both are explained in more detail with reference to theattached figure. In a specific exemplary embodiment, the machine to befastened is a thermal turbomachine or parts thereof, that is to say, forexample, a gas or steam turbine, a compressor, a generator or a gearunit. However, the present invention is in no way restricted thereto.

[0013] As shown in the single figure, the foundation 1 has a foundationrecess 3. An anchor shank 4 is located inside this foundation recess 3.In the figure, the anchor shank 4, at the bottom end, has two threadeddisks 5 arranged offset from one another. The anchor shank 4 is narrowedin the shank diameter between both threads, so that the top threadeddisk 5 can be screwed over the bottom thread of the anchor shank 4.

[0014] After that, a first layer of concrete 7 ₁ is first of all pouredinto the foundation recess 3, so that at least the bottom threaded disk5 is cast in place. After the first layer 7 ₁ has hardened, a secondlayer of concrete 7 ₂ is poured in and fills the remaining part of thefoundation recess 3. The threaded disks 5, which are each fastened withthreads to the anchor shank 4, form an abutment or a stop in interplaywith the foundation recess 3 filled with concrete 7 ₁, 7 ₂, so that,after the fastening has been effected, the machine base 8 can berestrained. The threaded disks 5 are secured against rotation bythreaded locking means.

[0015] Since the anchor shank 4 is sunk in the foundation recess 3, thesetting-up of the machine is in no way impaired. In this case, afoundation plate 2 serves as seating for the machine. Said foundationplate 2 is completely cast in place by fine cast concrete 11. Themachine base 8 is put onto the foundation plate 2 oriented or leveledwith adjusting screws 12, and the anchor shank 4, by means of ananti-fatigue bolt/stud bolt 9, is connected through the machine base 8to an internal thread 6 connected in the anchor shank 4. As can be seenfrom the figure, as the last method step of the fastening, the anchorshank 4 is preloaded by a top clamping nut 10. The anti-fatigue bolt orstud bolt 9 screwed into the anchor shank 4 can be readily fitted by atorque wrench or even preloaded hydraulically. After the preloading, theclamping nut 10 is secured against loosening. The adjusting screws 12are then removed.

[0016] Obviously, numerous modifications and variations of the presentinvention are possible in light of the above teachings. It is thereforeto be understood that, within the scope of the appended claims, theinvention may be practiced otherwise than as specifically describedherein.

[0017] While the invention has been described in detail with referenceto preferred embodiments thereof, it will be apparent to one skilled inthe art that various changes can be made, and equivalents employed,without departing from the scope of the invention. Each of theaforementioned documents is incorporated by reference herein in itsentirety.

LIST OF DESIGNATIONS

[0018]1 Foundation

[0019]2 Foundation plate

[0020]3 Foundation recess

[0021]4 Anchor shank

[0022]5 Threaded disk

[0023]6 Internal thread

[0024]7 ₁, 7 ₂ Concrete

[0025]8 Machine base

[0026]9 Anti-fatigue bolt/stud bolt

[0027]10 Clamping nut

[0028]11 Fine cast concrete

[0029]12 Adjusting screw

What is claimed is:
 1. A fastening arrangement of a machine base of amachine on foundations, comprising: a foundation including a foundationrecess and a foundation plate of steel on a surface of the foundation; amachine base on a surface of the foundation plate; an anchor shankconfigured and arranged to restrain the machine against the foundation,the anchor shank located in the foundation recess and having at leasttwo threaded disks offset from one another; the foundation recess beingfilled with concrete; and an anti-fatigue bolt or a stud bolt passingthrough the foundation plate and the machine base, the bolt connected tothe anchor shank and preloaded.
 2. The fastening arrangement as claimedin claim 1, wherein the anchor shank has a narrowed shank diameterbetween the two threads of the threaded disks.
 3. The fasteningarrangement as claimed in claim 1, further comprising: threaded lockingmeans for securing the threaded disks against rotation.
 4. The fasteningarrangement as claimed in claim 1, further comprising: a clamping nutpreloading the anti-fatigue bolt or the stud bolt.
 5. The fasteningarrangement as claimed in claim 1, further comprising: a layer of fineconcrete located between the surface of the foundation and thefoundation plate.
 6. A method of fastening a machine base of a machineon a foundation, the method comprising: preparing a foundation recess inthe foundation with an inner anchor shank in the foundation recess, theanchor shank having at least two threaded disks offset from one another;filling the foundation recess with concrete and hardening the concrete;positioning a foundation plate of steel onto a surface of thefoundation; setting down the machine base onto the foundation plate;connecting the anchor shank through the machine base and the foundationplate to an internal thread located in the anchor shank with ananti-fatigue bolt or a stud bolt; and preloading the bolt.
 7. The methodas claimed in claim 6, further comprising: first pouring a first layerof concrete into the foundation recess so that at least the bottomthreaded disk is cast in place; and thereafter pouring a second layer ofconcrete and filling the remaining part of the foundation recess.
 8. Themethod as claimed in claim 6, comprising: preloading the anchor shank bya top clamping nut; and securing the top clamping nut against looseningafter the preloading.
 9. The method as claimed in claim 6, whereinpreloading comprises preloading the bolt hydraulically or by a torquewrench.
 10. The method as claimed in claim 6, comprising: afterpositioning the foundation plate, orienting the foundation plate byadjusting screws located in the foundation plate; and removing theadjusting screws after fastening the machine base.